Ответ:
1. a) 0,4a⁴b³ + 1,6a³b⁴
б) 2a² + b²
в) 4a² + 2a - 1
2. а) x = 20
б) х = -1
в) х = 0
Объяснение:
1. a) 2a²b³(0,2a² + 0,8ab) = 0,4a⁴b³ + 1,6a³b⁴
б) 2a(a + b) - b(2a - b) = 2a² + 2ab - 2ab + b² = 2a² + b²
в) -1(-4a² - 2a + 1) = 4a² + 2a - 1
2. а) 8 - 3(x - 2) + 2(x + 3) = 0
8 - 3x + 6 + 2x + 6 = 0
20 = x
б) 8x - 4(6x + 1) = 12
8x - 24x - 4 = 12
-16x = 16
x = -1
в) -1(2x - 6) = 6
-2x + 6 = 6
-2x = 0
x = 0
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Verified answer
Ответ:
1. a) 0,4a⁴b³ + 1,6a³b⁴
б) 2a² + b²
в) 4a² + 2a - 1
2. а) x = 20
б) х = -1
в) х = 0
Объяснение:
1. a) 2a²b³(0,2a² + 0,8ab) = 0,4a⁴b³ + 1,6a³b⁴
б) 2a(a + b) - b(2a - b) = 2a² + 2ab - 2ab + b² = 2a² + b²
в) -1(-4a² - 2a + 1) = 4a² + 2a - 1
2. а) 8 - 3(x - 2) + 2(x + 3) = 0
8 - 3x + 6 + 2x + 6 = 0
20 = x
б) 8x - 4(6x + 1) = 12
8x - 24x - 4 = 12
-16x = 16
x = -1
в) -1(2x - 6) = 6
-2x + 6 = 6
-2x = 0
x = 0